Attachment for carpenters&#39; braces.



P. R. DUGHEMIN. ATTAGHMENT FOR CARPENTERS BRAGES.

APPLICATION FILED SEPT. 7, 1910.

1,031,540. Patented July 2,1912.

2 SHEETS-SHEET 2.

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COLUMBIA PLANODRAPH 60., WASHINGTON, D. c.

rinrrnn s'ra rns PATENT oFFIoE.

PETER R. DUCHEMIN, OF SPOKANE, WASHINGTON.

ATTACHMENT FOR CARPENTERS BRACE'S.

To all whom it may concern:

Be it known that I, PETER R. DUCHEMIN, citizen of the United States, residing at Spokane, in the county of Spokane and State of Washington, have invent-ed certain new and useful Improvements in Attachments for Carpenters Braces, of which the following is a specification.

This invention relates to bit holding attachments for carpenters braces and has for its object the provision of a comparatively simple and thoroughly eflicient device of this character, the construction of which is such that the bit may be rotated at a high speed, while the crank arm of the brace is rotated at a comparatively low speed.

A further object of the invention is to provide a brace attachment including a support-ing frame having a master gear mounted for rotation therein and provided with a shank extending vertically from one side of the frame for engagement with a brace, the chuck or tool holder being mounted for rotation on the other side of the frame and fitted in a pinion meshing with the master gear.

A further object is to provide a plurality of pinions of different diameters meshing with the master gear and each provided with a depending head for engagement with the chuck so that by changing the chuck from one pinion to the other, said chuck may be rotated at different speeds.

A still further object of the invention is generally to improve this class of devices,

so as to increase their utility, durability and efficiency, as well as to reduce the costof manufacture.

Further objects and advantages will ap pear in the following description, it being understood that various changes in form, proportions and minor details of construction may be resorted to within the scope of the appended claims.

For a full understanding of the invention and the merits thereof, reference is to be had to the following description and accompanying drawings, in which:

Figure 1 is a perspective view of a carpenters brace attachment constructed in accordance with my invention; Fig. 2 is a top plan View of the same; Fig. 3 is a longitudinal sectional view; Fig. 4 is a side elevation of the socket engaging shank detached; Fig. 5 is a bottom plan view of the frame with the operating mechanism detached; Fig. 6 is a Specification of Letters Patent.

Application filed September 7, 1910.

Patented July 2,1912.

Serial No. 580,842.

bottom plan view of the master gear detached; Fig. 7 is a side elevation of the tool holder or chuck detached, showing the pinion carrying shank in position therein.

Corresponding and like parts are referred to in the following description and indicated in all the views of the drawings by the same reference characters.

The device comprises an open-sided frame 5, preferably rectangular in shape, as shown, and formed of metal or other suitable material, said frame having its opposite ends provided with threaded openings adapted to receive the correspondingly threaded end 6 of a supporting handle 7.

Mounted for rotation within the frame 5, is a master gear 8 having internal teeth 9 and provided with intersecting arms 10, there being a square opening 11 formed in the arms at the intersection thereof and adapted toreceive a correspondingly squared portion 12 formed on a pin 13. The upper end of the pin 13 is provided with a cylindrical portion 14 which fits in an opening in the top of the frame 5, while the lower end thereof extends through the bottom of the frame said pin being retained in position on the frame by a suitable fastening device 15. The upper portion of the pin 13 is provided with a rectangular shank 16 adapted to receive the socket 17 of a carpenters brace of any suitable construction.

Mounted for rotation within the supporting frame 5, on opposite sides of the pin 13,

.are pinions 18 and 19, said pinions being of different sizes and meshing with the master gear 8. Depending from each pinion, is a stub shaft 20 having a cylindrical portion 21 which engages a correspondingly shaped opening formed in the bottom of the frame 5 and provided with a squared portion 22 which engages a square opening formed in the adjacent pinion, said square portion 22 defining a reduced threaded extension 23 adapted to receive a nut or similar fastening device 24: by means of which the stub shafts are retained in position on the frame.

The lower portion of each stub shaft is provided with a laterally extending flange 25 and a square depending shank 26 adapted to enter a correspondingly shaped socket formed in a tool holder or chuck 27 of any suitable construction. Interposed between the flange 25 of each stub shaft and the lower portion of the frame 5, are a plurality of anti-friction balls 28, the latter being carried by the flange 25 and arranged to rotate in a suitable race-way 29 formed in the bottom of the frame.

The chuck 27 is detachably secured to the shank of the adjacent stub shaft by a screw or similar fastening device 30, which latter pierces the upper end of the chuck and enters a suitable opening 31 formed in the shank, so that said tool holder or chuck may be attached to either shank for the pur-- pose of rotating the bit at different speeds.

The upper portion of the master gear 8 is preferably provided with a boss 32 which bears against the adjacent face of the frame 5 and serves to space the master gear therefrom, there being a similar boss formed on the upper surface of the frame and bearing against the base of the shank 16, as shown.

Thus it will be seen that the chuck may be keyed to the shank of either stub shaft so that when the master gear is rotated by means of the brace, motion will be transmitted from said master gear to the adjacent pinion and thus actuate the drill or other tool.

In operation, the chuck 27 is secured to the stub shaft of one of the pinions, say for instance, the pinion 18, by means of the fastening device 30 and the attachment supported by grasping the handle 7 in one hand and the crank arm of the brace with the other. By rotating the crank arm of the brace, motion will be transmitted through the master gear and pinion 18 to the chuck, thus revolving the bit at a high speed, while the brace is rotated at a comparatively low speed.

By detaching the chuck from the stub shaft of the pinion 18 and fastening said chuck to the stub shaft of the pinion 19 and rotating the crank arm of the brace, the bit may be rotated at a different speed.

Having thus described the invention, what is claimed as new is:

1. A device of the class described including a frame, an internal master gear journaled in the frame and provided with an upstanding shank for engagement with a brace, a supporting handle secured to the frame, oppositely disposed pinions of different sizes mounted for rotation within said frame and meshing with the teeth of the master gear, stub shafts depending from the pinions and provided with angular shanks, and a tool chuck having a socket adapted to receive the shank of either stub shaft.

2. A device of the class described including a substantially rectangular open-sided frame having a supporting handle extending laterally from one side thereof, a pin journaled in the walls of the frame and provided with an angular shank for engagement with a brace, an. internal master gear keyed to and mounted for rotation with the pin, pinions of different sizes meshing with the master gear and having angular openings formed therein, stub shafts having corresponding angular portions adapted to enter the angular openings in the adjacent pinions and having their upper ends threaded and their lower ends provided with depending angular shanks, nuts engaging the threaded ends of the stub shafts and bearing against the adjacent pinions, a tool chuck having a socket adapted to receive the shank of either stub shaft, and means for detachably securing the chuck in position on the adjacent stub shaft.

3. A device of the class described including an open-sided frame, a master gear mounted for rotation between the upper and lower walls of the frame and having inter nal teeth and upwardly curved spokes connected by a hub, a pin journaled in the upper wall of the frame and having an angular portion seated in an angular opening in the hub of the master gear and provided with an angular shank for engagement with a brace, stub shafts depending from the frame and provided with angular shanks for detachable connection with a chuck, pinions secured to the upper ends of the stub shafts and meshing with the teeth of the master gear, each stub shaft having its upper end reduced and threaded, and nuts engaging the threaded ends of the stub shafts and bearing against the adjacent pinions, there being an opening formed in the upper wall of the frame opposite each nut.

4. A device of the class described comprising an open-sided rectangular frame provided in opposite ends with threaded sockets, a supporting handle having a threaded tang fitted in said sockets interchangeably, a master gear journaled in the frame.

and arranged for engagement with a brace, oppositely disposed pinions of different sizes mounted for rotation within said frame and meshing with the teeth of the mastergear, stub shafts depending from the pinions and provided with annular shanks, and a tool chuck having a socket adapted to receive the shank of either stub-shaft.

In testimony whereof, I affix my signature in presence of two witnesses.

Witnesses:

L. E. ALLEN, E. V. WILsoN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. G. V 

